/*
This file is part of the Notesnook project (https://notesnook.com/)

Copyright (C) 2023 Streetwriters (Private) Limited

This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/

export class ProgressStream extends TransformStream<Uint8Array, Uint8Array> {
  constructor(report: (totalRead: number, done?: boolean) => void) {
    let totalRead = 0;
    super({
      start() {},
      transform(chunk, controller) {
        controller.enqueue(chunk);
        report((totalRead += chunk.length));
      },
      flush() {
        report(totalRead, true);
      }
    });
  }
}
